Question: Alleghany Viburnam dropped leaves which turned brown and curled up. I don’t know if this is an insect or fungus problem or something else. How can I fix? Answer: Jonathan Foster, Home Horticulture Outreach Professional I’m not sure from the wording of your question if the leaves browned and curled before or after dropping. read more How can you treat an Alleghany Viburnam that dropped leaves?